Description of problem:
When ipa-getcert is requested with required parameter with argument, command simply shows detail help message. Instead, it should show particular fail message related to particular parameter.

For example,

# ipa-getcert request -d /tmp/sample -n cacertreq -t ipa-getcert - client certificate enrollment tool

Usage: ipa-getcert request [options]

Required arguments:

If using an NSS database for storage: -d DIR NSS database for key and cert -n NAME nickname for NSS-based storage (only valid with -d) -t NAME optional token name for NSS-based storage (only valid with -d)
Here, '-t' is required parameter with argument, but ipa-getcert show detail help message, instead of telling user about '-t' option requirements.

How reproducible:
100%

Actual results:
ipa-getcert shows full help message

Expected results:
ipa-getcert should show exact argument and parameter missing.

Additional Info : 
Upstream ticket - https://fedorahosted.org/certmonger/ticket/44